I'm INTJ female as well and have spent a long time looking into and researching MBTI and the underlying cognitive functions. I could go on and on about the credibility of the test and its uses and purposes, but no one wants to read all that. It's all available online for the curious individual anyway. I'll just say, there is some merit to it, especially in personal development, and it's very useful for improving your understanding of yourself and others, with caution of course. All of this would require a deeper dive into all the types and their 8 cognitive functions, which the casual 'test taker' won't do.
There is also a lot to say on this topic and its possible relation to comic creation, but it's a whole lot of minutia to go through and explain...I think anyone interested could figure it out on their own.